Long exposure and dots

Discussion in 'Photography Equipment & Products' started by Dreo, Dec 2, 2006.

  1. Dreo

    Dreo TPF Noob!

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    Hi there!

    I've just bought Fuji's new model 6500fd and have troubles while making long exposure photos (2sec and more).

    It looks like this (iso100/5.6/10s):
    [​IMG]

    Unfortunately this makes the camera unusable to take photos of stars, fireworks etc.

    It seems to be hot pixels. Usually it is solved by making another pic with closed shutter and substracting it (and even my old Nikon Coolpix 2200 did it), but I cannot find an option to enable this feature on the new Fuji. Any help is appreciated.
     
  2. Alex_B

    Alex_B No longer a newbie, moving up!

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    do you shoot in RAW? some raw converters have options to idetify hot pixels automatically and remove them in the image.

    guess there is software that works on JPEGs too.
     
  3. Dreo

    Dreo TPF Noob!

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    Hi, thanks for reply. I've found out that when shooting to RAW with Sharpness set to Fine hot pixels are almost invisible up to cca. 6 sec. Much better.

    Btw, I was told that another solution is to "emulate" hot pixels elimination function - after taking the photo, take another with lens cap on a camera and then "substract" the photos using some specialised software.

    But still, I'm very surprised that there's no build-in hot pixels elimination feature. I've read about 10 reviews before buying the camera and found not a single note about this.
     
  4. markc

    markc TPF Noob!

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    BTW, a hot pixel will show up all the time, not just on long exposures. They are stuck on. This is probably noise. Try looking into noise elimination and long exposures; you might find something more useful.
     
  5. astrostu

    astrostu Guest

    Since hot pixels are 1 pixel in size, you can remove them with the Photoshop dust and scratches filter without eliminating stars, fireworks, etc., since those will be larger than 1 pixel.
     
  6. Dreo

    Dreo TPF Noob!

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    Thanks for your help.

    I made a comparison of hot pixel occurence on two photos - both taken with fuji 6500fd (two different devices). the first part is my camera (both iso 100, time 10s, the rest is also the same). I'm considering returning it. What do you think? Is this a real reason or am I making a mountain out of a molehill?

    [​IMG]
     
  7. markc

    markc TPF Noob!

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    How does yours look with a lens cap and 1/1000 sec?

    If another camera is fine, and this issue is causing you problems, then yeah, I'd see if they will do a swap or repair.
     
  8. Dreo

    Dreo TPF Noob!

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    Dots are visible only for longer times, 2 seconds and more. I've just tried 1/1000s with lens cap - it's not absolute dark, but definitely no dots are visible.
     
  9. markc

    markc TPF Noob!

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    Definitely not hot pixels then. Might still be worth talking to them about the noise, though.
     
  10. Dreo

    Dreo TPF Noob!

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    I don't think so - dots are at the same place on every photo.

    Strange that Fuji cameras has no long exposure noise elimination. I'm going to call to Fuji. From what I found out on another forum it seems that more users are unsatisfied with this. Maybe we can force them to release new firmware :)
     
  11. markc

    markc TPF Noob!

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    I guess people are using the term differently than I was used to. I always knew "hot pixels" to mean pixels that were permanently stuck on, like with LCD monitors, but I guess I can see them using it for this meaning. For my definitions, these are warm pixels, but I guess that doesn't help for searches. It's like when people use SLR to mean a camera with interchangeable lenses. It messing up distinctions and makes it hard to get good information.

    I found this software: http://www.mediachance.com/digicam/hotpixels.htm
    Don't know how good it is. I've never used it.
     

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